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Rare & Remarkable Human Traits

What Is the Rarest Hair Color in the World?

Natural red hair is usually named the rarest color, held by an estimated 1–2% of people. Learn why it's scarce and where it clusters.

By Written Facts StaffOctober 26, 20267 min read

Look around a crowded room, a stadium, or a Halloween party full of orange wigs, and you can usually count the natural redheads on one hand. That's not just your impression. Natural red hair is generally named the rarest hair color in the world, worn by an estimated 1–2% of people. Here is why it's so scarce, where it clusters, how blond hair compares (including a striking case in the South Pacific), and why "rarest" is harder to pin down than it sounds.

The short answer: red

When people ask which hair color is rarest, the usual answer is natural red. The Oklahoma Medical Research Foundation (OMRF) has estimated that only 1–2% of the world's population has red hair. Barry Starr, writing for KQED's science series Quest, gave a similar figure of "around 1%" and noted that it was a number he had seen passed around, not one he had measured himself.

That caveat matters. No global census of hair color exists. Nobody has lined up eight billion people and sorted them by shade. The worldwide figures are estimates built up from regional studies and genetic data, which is why you'll see them quoted as ranges and not exact counts.

"Rarest" also depends on what you count. Do strawberry blond and auburn count as red? Does dyed hair count? Do you count a child whose bright copper hair will turn brown by age ten? Do you count white hair caused by a medical condition, or gray hair that comes with age? Change the rules and you can get a different answer.

Still, when the question means natural hair color across the world's population, red is the most common answer, and the genetics explain why.

Why red hair is so rare

Hair color comes down to melanin, the pigment your body makes, and in particular two kinds of it. According to MedlinePlus, the U.S. National Library of Medicine's genetics guide, eumelanin produces black and brown hair, and pheomelanin produces red. Blond hair has very little eumelanin. Your hair color depends on how much of each pigment you have and in what mix.

The key gene for red hair is MC1R. MedlinePlus explains that people with two working copies of MC1R usually have black or brown hair. One copy with a loss-of-function change lowers eumelanin and can give strawberry blond, auburn or red hair. Two such copies typically give very red hair.

That's what makes red hair recessive. Most redheads have two copies of a red-hair MC1R variant, one from each parent. Two parents without red hair can still have a redheaded child if both carry a variant without showing it. According to Wikipedia's summary of the research, about 80% of redheads have a variant from a group known as the "RHC" (red hair color) alleles.

How many people quietly carry a red-hair variant? Estimates disagree a lot. OMRF has put it at about 40% of people. Starr's KQED piece gives about 4%. The gap probably comes from which variants each estimate counts, so treat both numbers with caution. Either way, the pattern is the same: the gene is far more common than the hair, because you need two copies before the red shows.

Where redheads live

Red hair isn't spread evenly around the world. It clusters in Northwestern Europe. Wikipedia reports that red hair appears in 2–6% of people of Northwestern European ancestry and less often in other populations.

Scotland has the highest rate per person. Wikipedia, citing a 2011 estimate by Moffat and Wilson, puts the share of Scots with red hair at about 13%. Older data gave a lower number: a 1907 study by Gray of more than 500,000 people found 5.3%. Hidden carriers are much more common than visible redheads there. The same source reports red-hair gene variants in about 40% of people in south-east Scotland and about 29% in the Gaelic North-West and the Hebrides.

Ireland is usually ranked second. OMRF has put the share of Irish redheads at about 10%.

Figures for both countries vary from source to source, and you'll often see higher numbers repeated online. Methods differ: some studies count only vivid red, while others include auburn and strawberry blond. The overall pattern holds up, though. Red hair is far more common in Scotland and Ireland than anywhere else, and much less common elsewhere.

Where blond hair fits

If red is the rarest, blond is the obvious next guess. Natural blond hair is also uncommon worldwide, but no solid global percentage exists. The figures that get passed around online have no good survey behind them, so it's more accurate to say blond is uncommon than to put a number on it.

Blond hair also has one of the most surprising stories in human genetics. In the Solomon Islands in the South Pacific, many people with deeply pigmented skin have naturally blond hair, especially as children. For years, a common guess was that the trait came from European sailors, traders or missionaries.

A 2012 study in Science by Eimear Kenny and colleagues showed otherwise. The researchers, using samples collected in 2009, found that a single amino acid change in a gene called TYRP1 is a major cause of blond hair in Solomon Islanders. Like red hair, it is recessive: according to NBC News's coverage, a child needs a copy from each parent to be blond. The gene sits on chromosome 9.

The variant makes up 26% of the copies of this gene in the Solomon Islands. That figure counts gene copies, not people. It wasn't found outside Oceania, including in Europeans. In other words, Solomon Islands blond hair isn't a European import. It arose independently through a different gene.

How many islanders are blond hasn't been formally measured. Study co-author Sean Myles told NBC News that, based on an earlier visit, he guessed 5–10% of Solomon Islands children have light hair. That was a rough field impression, not a count.

Caveats: dye, age and "rarest"

A few things make any hair color ranking fuzzy.

Hair changes with age. MedlinePlus notes that in people of European descent, light hair often darkens during childhood. A blond toddler may be a brown-haired adult, so the age you count at changes the totals.
Dye hides the real numbers. Plenty of people you see with red or blond hair didn't start that way, and plenty of natural redheads color their hair. Counting by looking at people is unreliable.
Many genes are involved. MedlinePlus stresses that hair color is shaped by many genes, not just one. That's part of why the shades blend into each other and why categories like "auburn" are hard to define.
"Rarest" is a judgment. It depends on what you count, as the first section showed.

The bottom line: natural red hair is the color most often named the rarest, with estimates of about 1–2% of people worldwide. It's rare because it usually takes two copies of a recessive MC1R variant, and it's far more common in Scotland and Ireland than anywhere else. Blond is also uncommon, and in the Solomon Islands it evolved on its own through a completely different gene.

Sources (6)

Photo: Red-Haired Woman and Car Trailer Monument Valley (UT) by Ron Cogswell, BY 2.0.